E-100 (Gerat 383) was a German super-heavy tank design. The basic design was ordered by the Waffenamt as a parallel development to the Porsche Maus in June 1943. It was the heaviest of a family of vehicles meant to standardize as many components as possible. After 1944 work continued at a very slow pace and canceled in favor of the Maus. The first prototype was never completed and was found by allied forces on the factory floor in 1945. The partially completed vehicle was removed by the British Army for evaluation and then scrapped.